The invention relates to a method and a control device for operating a drive train of a motor vehicle. A group transmission; and a separation clutch connected therebetween. In order to carry out the downshift, the following steps are carried out: opening the disconnect clutch and shifting the partial transmission to be shifted into neutral. Then, in order to shift the partial transmission to be shifted into the target gear, a target rotational speed is specified for the input shaft and the drive unit of the group transmission, and in order to synchronize the form-fitting shift elements to be closed of the partial transmission to be shifted, the target rotational speed is shifted into the target gear. The drive unit is actuated in dependence on the target rotational speed and the disconnect clutch is shifted to a first position transmitting the first torque. The actual rotational speed established at the input shaft during synchronization is monitored, the disconnect clutch is shifted to a second position transmitting a second torque when the rotational speed difference between the actual rotational speed of the input shaft and the target rotational speed is greater than a threshold value, the transmission brake is actuated to be closed in order to reduce the rotational speed difference, and the form-fitting shift element to be closed is closed.
用于运行机动车的驱动系的方法和控制器,驱动系具有:驱动机组;分组变速器;和接在它们之间的分离离合器。为了实施降档,实施如下步骤:断开分离离合器,并将要切换的分变速器转变到空档。然后,为了将要切换的分变速器转变到目标档位,针对分组变速器的输入轴和驱动机组预先给定目标转速,为了使要切换的分变速器的要闭合的形状锁合切换元件同步,依赖于目标转速来操控驱动机组并将分离离合器转变到传递第一力矩的第一定位。监控在同步时在输入轴处构建的实际转速,当输入轴的实际转速与目标转速之间的转速差大于边界值时,将分离离合器转变到传递第二力矩的第二定位,操控变速器制动器闭合以减小转速差,并使要闭合的形状锁合切换元件闭合。
Method and control unit for operating drive train of motor vehicle
用于运行机动车的驱动系的方法和控制器
2023-06-06
Patent
Electronic Resource
Chinese
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